No longer compatible with Slack

[mmaunder]

This uses the Slack RTM API which requires creating a Classic Slack APP. Creating Classic apps is no longer supported. Which means the RTM API is no longer supported. Which means that this Node Red module no longer works and would need to be migrated to Bolt for it to work. I'd suggest putting a notice on the github README that it no longer works to save others some time, and perhaps withdraw it from the Node Red repo. Thanks.

When trying to use a modern Slack app auth token the error is: [INFO] @slack/client:RTMClient:11 unable to RTM start: An API error occurred: not_allowed_token_type

When trying to create a classic token, Slack responds with:

New creation of classic Slack apps has been discontinued
Creation of Slack classic apps has been discontinued since June 4, 2024. Learn how this may impact you and your team.

[janvda]

Indeed this node no longer works !

My existing node-red application is no longer able to send messages to my slack channels as of 4th of April 2025 (up to the 3rd of April it was still working)

I see the following error in the log files:

[INFO]  @slack/client:RTMClient:3 unable to RTM start: An API error occurred: legacy_custom_bots_deprecated

[janvda]

The following node-red node is working:

• https://flows.nodered.org/node/@headless-architecture/node-red-contrib-slack-bolt

but it suffers from regular crashes:

• App somehow unloaded from my space, crashed whole Node Red fishme/node-red-contrib-slack-bolt#7

[travisghansen]

Sad they deprecated the rtm api. My guess is this can be converted the to events api easily enough with perhaps some loss of functionality. I will at least look at it and see what I can discover.